Double genders is an issue that pops up now and then. I once wrote an extension to allow objects to have two genders at the same time (so that a horse or a statue can be both “her” and “it”). You find it here: [url]https://intfiction.org/t/pronouns-it-and-he-for-the-same-object/3016/1]. (You need to change the name of the file to ‘Second Gender.i7x’ before installing it.) Perhaps it’s time to submit it to the extensions page.
The built-in extension Plurality by Emily Short lets you declare the doll-chain to be ‘ambiguously plural’, and that will make it respond to both “them” and “it”.